<template>
	<view class="next-tree">
		<!-- @tap="_cancel" -->
		<view class="next-tree-mask" :class="{'show':showTree}"></view>
		<view class="next-tree-cnt" :class="{'show':showTree}">

			<view class="next-tree-view">
				<scroll-view class="next-tree-view-sc" :scroll-y="true">
					<block v-for="(item, index) in treeList" :key="index">
						<view class="next-tree-item" :style="[{
							paddingLeft: item.rank*15 + 'px',
							zIndex: item.rank*-1 +50
						}]" :class="{
							border: border === true,
							show: item.show,
							last: item.lastRank,
							showchild: item.showChild,
							open: item.open,
						}">
							<view class="next-tree-label" @tap.stop="_treeItemTap(item, index)">
								<image class="next-tree-icon"
									:src="item.lastRank ? lastIcon : item.showChild ? currentIcon : defaultIcon">
								</image>
								{{item.name}}
							</view>
							<view class="next-tree-check" @tap.stop="_treeItemSelect(item, index)"
								v-if="selectParent?true:item.lastRank">
								<view class="next-tree-check-yes" v-if="item.checked" :class="{'radio':!multiple}"
									:style="{'border-color':confirmColor, 'background-color':confirmColor}">
									<view class="next-tree-check-yes-b" :style="{'background-color':confirmColor}">
										<text class="icon-text">✔</text>
									</view>
								</view>
								<view class="next-tree-check-no" v-else :class="{'radio':!multiple}"
									:style="{'border-color':confirmColor}"></view>
							</view>
						</view>
					</block>
				</scroll-view>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		name: "next-tree",
		props: {
			treeData: {
				type: Array,
				default: function() {
					return []
				}
			},
			valueKey: {
				type: String,
				default: 'id'
			},
			labelKey: {
				type: String,
				default: 'label'
			},
			childrenKey: {
				type: String,
				default: 'children'
			},
			title: {
				type: String,
				default: ''
			},
			multiple: { // 是否可以多选
				type: Boolean,
				default: false
				// default: true
			},
			selectParent: { //是否可以选父级
				type: Boolean,
				default: false
			},
			foldAll: { //折叠时关闭所有已经打开的子集，再次打开时需要一级一级打开
				type: Boolean,
				default: false
			},
			confirmColor: { // 确定按钮颜色
				type: String,
				default: '#f9ae3d' // #f9ae3d
			},
			cancelColor: { // 取消按钮颜色
				type: String,
				default: '#00aa00' // #757575
			},
			titleColor: { // 标题颜色
				type: String,
				default: '#ff0000' // #757575
			},
			currentIcon: { // 展开时候的ic
				type: String,
				default: ''
			},
			defaultIcon: { // 折叠时候的ic
				type: String,
				default: ''
			},
			lastIcon: { // 没有子集的ic
				type: String,
				default: ''
			},
			border: { // 是否有分割线
				type: Boolean,
				default: false
			},
		},
		data() {
			return {
				showTree: true,
				treeList: [],
				selectIndex: -1,
				childNums: [],
				rt: [],
				rtName: [],
				rtCode: [],
				rtItem: [],
			}
		},
		watch: {
			treeList(val, oldVal) {
				console.log(val, oldVal);
			},
			
		},
		computed: {},
		methods: {
			_show() {
				this.showTree = true
			},
			_hide() {
				this.showTree = false
			},
			_cancel() {
				this._hide()
				this.$emit("cancel", '');
			},
			_confirm() {
				this.rt = [];
				this.rtName = [];
				let arr = []
				// this.rtCode=[];
				// this.rtItem=[];
				// 处理所选数据
				this.treeList.forEach((item, i) => {
					// if(item.id==100&&item.checked){
					// 	return this.confirmEach(this.treeData)
					// }
					// if (item.checked&&item.parentId&&item.parentId!="100") {
					// 	this.rt.push(item.id)
					// 	this.rtName.push(item.name)
					// }
					if (item.checked && item.parentId) {
						this.rt.push(item.id)
						this.rtName.push(item.name)
						arr.push(item)
						// this.rtCode.push(item.code)
						// this.rtItem.push(item.source)
					}
				})
				// this._hide()
				this.$emit("confirm", {
					id: this.rt,
					name: this.rtName,
					arr:arr,
					// rtCode:this.rtCode,
					// rtItem:this.rtItem,
				}, );
			},
			confirmEach(list) {
				list.forEach((item, index) => {
					if (item.isDy) {
						this.rtName.push(item.name)
						this.rt.push(item.id)
					}
					if (item.children && item.children.length > 0) this.confirmEach(item.children)
				})
			},
			//扁平化树结构
			_renderTreeList(list = [], rank = 0, parentId = [], parents = []) {
				list.forEach(item => {
					this.treeList.push({
						id: item[this.valueKey],
						name: item[this.labelKey],
						source: item,
						parentId, // 父级id数组
						parents, // 父级id数组
						rank, // 层级
						// showChild: false, //子级是否显示
						// open: false, //是否打开
						// show: rank === 0, // 自身是否显示
						showChild: true, //子级是否显示
						open: true, //是否打开
						show: true, // 自身是否显示
						hideArr: [],
						orChecked: item.checked ? item.checked : false,
						checked: item.checked ? item.checked : false,
					})
					if (Array.isArray(item[this.childrenKey]) && item[this.childrenKey].length > 0) {
						// console.log(item)
						let parentid = [...parentId],
							parentArr = [...parents],
							childrenid = [];
						delete parentArr.children
						parentid.push(item[this.valueKey]);
						parentArr.push({
							[this.valueKey]: item[this.valueKey],
							[this.labelKey]: item[this.labelKey]
						})
						this._renderTreeList(item[this.childrenKey], rank + 1, parentid, parentArr);
					} else {
						this.treeList[this.treeList.length - 1].lastRank = true;
					}
				})
			},
			// 处理默认选择
			_defaultSelect() {
				this.treeList.forEach((v, i) => {
					if (v.checked) {
						this.treeList.forEach((v2, i2) => {
							if (v.parentId.toString().indexOf(v2.parentId.toString()) >= 0) {
								v2.show = true
								if (v.parentId.includes(v2.id)) {
									v2.showChild = true;
									v2.open = true;
								}
							}
						})
					}
				})
			},
			// 点击
			_treeItemTap(item, index) {
				if (item.lastRank === true) {
					//点击最后一级时触发事件
					this.treeList[index].checked = !this.treeList[index].checked
					this._fixMultiple(index)
					return;
				}
				let list = this.treeList;
				let id = item.id;
				item.showChild = !item.showChild;
				item.open = item.showChild ? true : !item.open;
				list.forEach((childItem, i) => {
					if (item.showChild === false) {
						//隐藏所有子级
						if (!childItem.parentId.includes(id)) {
							return;
						}
						if (!this.foldAll) {
							if (childItem.lastRank !== true && !childItem.open) {
								childItem.showChild = false;
							}
							// 为隐藏的内容添加一个标记
							if (childItem.show) {
								childItem.hideArr[item.rank] = id
							}
						} else {
							if (childItem.lastRank !== true) {
								childItem.showChild = false;
							}
						}
						childItem.show = false;
					} else {
						// 打开子集
						if (childItem.parentId[childItem.parentId.length - 1] === id) {
							childItem.show = true;
						}
						// 打开被隐藏的子集
						if (childItem.parentId.includes(id) && !this.foldAll) {
							// console.log(childItem.hideArr)
							if (childItem.hideArr[item.rank] === id) {
								childItem.show = true;
								if (childItem.open && childItem.showChild) {
									childItem.showChild = true
								} else {
									childItem.showChild = false
								}
								childItem.hideArr[item.rank] = null
							}
						}
					}
				})
			},
			_treeItemSelect(item, index) {
				this.treeList[index].checked = !this.treeList[index].checked
				// 选父级, 子级自动全选
				// this.syncChecked(this.treeList, item.id, this.treeList[index].checked)
				if (item.rank > 0) {
					item.parentId.forEach((pid, indexP) => {
						const parent = this.treeList.filter(i => i.id === pid)
						const childNum = parent.length > 0 ? parent[0].childNum : 0
						if (this.childNums[pid] === undefined) {
							this.childNums[pid] = 1
						} else if (this.childNums[pid] < childNum) {
							this.childNums[pid]++
						}
					})
					//子级选择/选满/取消选择, 父级往上同步状态
					// this.setAncestors(item.parentId, this.treeList[index].checked)
				}
				this._fixMultiple(index)
			},
			syncChecked(trees, pid, checked) {
				trees.forEach((item, index) => {
					if (item.parentId.includes(pid)) {
						this.treeList[index].checked = checked
						this.syncChecked(trees, item.id, checked)
					} else if (item.children !== undefined) {
						this.syncChecked(item.children, pid, checked)
					}
				})
			},
			setAncestors(pids, checked) {
				this.treeList.forEach((item, index) => {
					if (pids.includes(item.id)) {
						if (checked && this.childNums[item.id] !== undefined && item.childNum === this.childNums[
								item.id]) {
							// 子级全部选中, 父级才选中
							this.treeList[index].checked = true
						} else {
							this.treeList[index].checked = false
						}
						this.setAncestors(item.parentId, checked)
					}
				})
			},
			// _treeItemSelect(item, index) {
			// 	this.treeList[index].checked = !this.treeList[index].checked
			// 	this._fixMultiple(index)
			// },
			// 处理单选多选
			_fixMultiple(index) {
				if (!this.multiple) {
					// 如果是单选
					this.treeList.forEach((v, i) => {
						if (i != index) {
							this.treeList[i].checked = false
						} else {
							this.treeList[i].checked = true
						}
					})
				}
			},
			// 重置数据
			_reTreeList() {
				this.treeList.forEach((v, i) => {
					this.treeList[i].checked = v.orChecked
				})
			},
			_initTree(treeData = this.treeData) {
				this.treeList = [];
				this._renderTreeList(treeData);
				this.$nextTick(() => {
					this._defaultSelect(treeData)
				})
			}
		},
		mounted() {
			console.log('----------next-tree组件完成挂载demo------------')
			this._initTree();
			this.$watch(() => this.treeData, (list) => {
				this._initTree(list);
			}, {
				deep: true,
				immediate: true
			})
			this.$watch(() => [this.multiple, this.selectParent], () => {
				if (this.treeData.length) {
					this._reTreeList();
				}
			}, {
				deep: true,
				immediate: true
			})
		}
	}
</script>

<style scoped>
	.next-tree-mask {
		/* position: fixed;
  top: 0rpx;
  right: 0rpx;
  bottom: 0rpx;
  left: 0rpx; */
		z-index: 9998;
		background-color: rgba(0, 0, 0, 0.6);
		opacity: 0;
		transition: all 0.3s ease;
		visibility: hidden;
	}

	.next-tree-mask.show {
		visibility: visible;
		opacity: 1;
	}

	.next-tree-cnt {
		/* position: fixed;
  top: 0rpx;
  right: 0rpx;
  bottom: 0rpx;
  left: 0rpx; */
		z-index: 9999;
		top: 160rpx;
		transition: all 0.3s ease;
		transform: translateY(100%);
	}

	.next-tree-cnt.show {
		transform: translateY(0);
	}

	.next-tree-bar {
		background-color: #fff;
		height: 120rpx;
		padding-left: 20rpx;
		padding-right: 20rpx;
		display: flex;
		justify-content: space-between;
		align-items: center;
		box-sizing: border-box;
		border-bottom-width: 1rpx !important;
		border-bottom-style: solid;
		border-bottom-color: #f5f5f5;
		font-size: 32rpx;
		color: #757575;
		line-height: 1;
	}

	.next-tree-bar-confirm {
		color: #f9ae3d;
	}

	.next-tree-view {
		/* position: absolute;
  top: 0rpx;
  right: 0rpx;
  bottom: 0rpx;
  left: 0rpx;
  top: 72rpx; */
		background-color: #fff;
		padding-top: 20rpx;
		padding-right: 20rpx;
		padding-bottom: 20rpx;
		padding-left: 20rpx;
	}

	.next-tree-view-sc {
		height: 100%;
		overflow: hidden;
	}

	.next-tree-item {
		display: flex;
		justify-content: space-between;
		align-items: center;
		font-size: 26rpx;
		color: #757575;
		line-height: 1;
		height: 0;
		opacity: 0;
		transition: 0.2s;
		/* position: relative; */
		overflow: hidden;
	}

	.next-tree-item.show {
		height: 80rpx;
		opacity: 1;
	}

	.next-tree-item.showchild:before {
		transform: rotate(90deg);
	}

	.next-tree-item.border {
		border-bottom: 1rpx solid rgba(204, 204, 204, 0.2);
	}

	.next-tree-item.last:before {
		opacity: 0;
	}

	.next-tree-icon {
		width: 26rpx;
		height: 26rpx;
		margin-right: 8rpx;
	}

	.next-tree-label {
		flex: 1;
		display: flex;
		align-items: center;
		height: 100%;
		line-height: 1.2;
	}

	.next-tree-check {
		width: 40px;
		height: 40px;
		display: flex;
		justify-content: center;
		align-items: center;
	}

	.next-tree-check-yes,
	.next-tree-check-no {
		width: 20px;
		height: 20px;
		border-top-left-radius: 20%;
		border-top-right-radius: 20%;
		border-bottom-right-radius: 20%;
		border-bottom-left-radius: 20%;
		border-top-width: 1rpx;
		border-left-width: 1rpx;
		border-bottom-width: 1rpx;
		border-right-width: 1rpx;
		border-style: solid;
		border-color: #f9ae3d;
		display: flex;
		justify-content: center;
		align-items: center;
		box-sizing: border-box;
	}

	.next-tree-check-yes-b {
		border-top-left-radius: 20%;
		border-top-right-radius: 20%;
		border-bottom-right-radius: 20%;
		border-bottom-left-radius: 20%;
		background-color: #f9ae3d;
		color: #fff;
	}

	.next-tree-check-yes-b .icon-text {
		font-size: 14px;
		font-weight: normal;
		font-family: uicon-iconfont;
		display: flex;
		flex-direction: row;
		align-items: center;
	}

	.next-tree-check .radio {
		border-top-left-radius: 50%;
		border-top-right-radius: 50%;
		border-bottom-right-radius: 50%;
		border-bottom-left-radius: 50%;
	}

	.next-tree-check .radio .next-tree-check-yes-b {
		border-top-left-radius: 50%;
		border-top-right-radius: 50%;
		border-bottom-right-radius: 50%;
		border-bottom-left-radius: 50%;
	}

	.hover-c {
		opacity: 0.6;
	}
</style>